A whiff of desperation or just a publicity ploy.
I don't know if he'll actually name a VP, but fueling the speculation that he might accomplishes that goal as well.
(Explanatory note. The top level right uses Robert Novak as a press release agency for "leaks." So, at any time, what Novak prints may be true or may not be, but you can be certain that someone wanted it out there for a reason.
Interpret this within that context.)